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Delco spark plug ID mark
Posted to Technical Discussion Forum on 4/27/2009 4 Replies

Quick question, folks...

I had in a 2003 "new style" GMC Sierra with the 5.3 V8 LM7. There was no history on said vehicle, and the spark plugs are suspected to be original. They are AC Delco branded, and have both the GM and Delco numbers on them: 12571644 /... Login to read more.

4 Replies Received (View Replies)

 

car Vehicle Data

2003 GMC Sierra 1500 5.3L

Engine5.3 L
Trans4-speed Automatic (Electronic)

car Vehicle Data

2003 GMC Sierra 1500 5.3L

Engine5.3 L
Trans4-speed Automatic (Electronic)